Q. Monochromatic light of wavelength in incident from air on a water surface. and are the wavelength of reflected and refracted light respectively, and are the velocities of reflected and refractive light, respectively. [Refractive index of water is ]
The velocities of reflected and refracted light is and , respectively. Then, is (ratio of frequency) is

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Solution:

On reflection and refraction, frequency of light remains the same.